Portion of a golf club head



FIG. 1 is a rear perspective view of a portion of a golf club head showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a heel end view thereof; and,

FIG. 4 is a bottom view thereof.

The broken line immediately adjacent to the shaded region forms an unclaimed boundary of the design. The broken line showing of the remainder of the golf club head is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a golf club head, as shown and described. 